Do not hardcode DB_PATH

I am struggling with my database which used to work before I uninstalled my app (ironically that's what I had to do the first time to get it working) anyway I've redone my code because I want to avoid using hard code path such as private static final String DB_PATH = "/data/data/my_package/databases/";

When I use the code below, I get the full database path from the System.out.println which is "/data/data/my_package/databases/lm.sqlite";

        File outFile =context.getDatabasePath(DB_NAME);
    String fullPATH =outFile.getPath();
    System.out.println("PRINT OUTPUT FILENAME: " +  fullPATH)

DatabaseHelper:

    public class DatabaseHelper extends SQLiteOpenHelper {

    private static final String DB_NAME  = "lm.sqlite";
    private static final int DB_VERSION  = 1;
    private static final String TABLE_LM = "lmtable";
    //private static final String DB_PATH = "/data/data/my_package/databases/"; 

    private SQLiteDatabase myDB; 
    private Context context;

    public DatabaseHelper(Context context) {
    super(context, DB_NAME, null, DB_VERSION);
    this.context = context;

    File outFile =context.getDatabasePath(DB_NAME);
    String fullPATH =outFile.getPath();
    System.out.println("PRINT OUTPUT FILENAME: " +  fullPATH);

    }

How should I change my previous DB_PATH in checkDataBase(), copyDataBase() and openDataBase() methods, I tried to change FROM String myPath = DB_PATH + DB_NAME TO String myPath = fullPATH but an error is returned: fullPATH cannot be resolved to a variable

DatabaseHelper Methods: (Note DB_PATH)

    private boolean checkDataBase() {
    SQLiteDatabase tempDB = null;
    try {
        String myPath = DB_PATH + DB_NAME;
        tempDB = SQLiteDatabase.openDatabase(myPath, null,
            SQLiteDatabase.OPEN_READWRITE);
    } catch (SQLiteException e) {
        Log.e("ts01 - check", e.getMessage());
    }
    if (tempDB != null)
        tempDB.close();
    return tempDB != null ? true : false;
    }

public void copyDataBase() throws IOException{
    try {
    InputStream myInput = context.getAssets().open(DB_NAME);
    String outputFileName = DB_PATH + DB_NAME;
    OutputStream myOutput = new FileOutputStream(outputFileName);

    byte[] buffer = new byte[1024];
    int length;

    while((length = myInput.read(buffer))>0){
        myOutput.write(buffer, 0, length);
    }

    myOutput.flush();
    myOutput.close();
    myInput.close();
    } catch (Exception e) {
    Log.e("ts02 - copyDatabase", e.getMessage());
    }

    }

public void openDataBase() throws SQLException{
    String myPath = DB_PATH + DB_NAME;
    myDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
}